“When you insulate your basement on the inside, the rubble foundation will freeze apart, and you will get swelling from the freezing soil collapsing the wall, and adfreezing will lift the wall so high you will need a ladder to get down from the sump pit.”

That’s what some builders in cold climates tell Joseph Lstiburek when he tells them they need to insulate their foundation walls. The fact is, they’re wrong. So, how about that ground frost penetration and those basement foundations? For those who live where lakes and ponds never freeze over, don’t worry about any of this. Insulate the basement and be done. But for the others … (Building Science.com)

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